package com.xr.generator.utils;

import com.alibaba.fastjson.JSON;
import org.jetbrains.annotations.NotNull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 全局异常处理器
 */
@Component
public class RRExceptionHandler implements HandlerExceptionResolver {

	private final Logger logger = LoggerFactory.getLogger(getClass());

	@Override
	public ModelAndView resolveException(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response,
			Object handler, @NotNull Exception ex) {
		R r = new R();
		try {
			response.setContentType("application/json;charset=utf-8");
			response.setCharacterEncoding("utf-8");
			if (ex instanceof RRException) {
				r.put("code", ((RRException) ex).getCode());
				r.put("msg", ex.getMessage());
			}
			else if (ex instanceof DuplicateKeyException) {
				r = R.error("数据库中已存在该记录");
			}
			else {
				r = R.error();
			}
			// 打印异常日志
			logger.error(ex.getMessage(), ex);
			String json = JSON.toJSONString(r);
			response.getWriter().print(json);
		}
		catch (Exception e) {
			logger.error("RRExceptionHandler异常处理失败", e);
		}
		return new ModelAndView();
	}

}
